I will be possible(but most probably difficult)to deactive them but only if they are not all homozygous for those particular genes. You have to have at least one bird with a different(=red-free)allele(it applies to all those involved red genes).

I will be possible(but most probably difficult)to deactive them but only if they are not all homozygous for those particular genes. You have to have at least one bird with a different(=red-free)allele(it applies to all those involved red genes).

When we have knowledge on how to distinguish the difference between sex-linked red, autosomale red and salmon red we can act to deactive them in the way you discribe Wieslaw but what about those red-pigment producing genes we do not know, so we can not determine them, how shall we know if they are Dominant/recessive, homozygous/heterozygous to can take action against them ?

Maybe we dramatize a little, maybe these "other" producing red-pigment genes are so exceptional that we hardly ever will encounter them in our private poultries !

Yes indeed BUT I talk about Silkies ! I have had roosters and hens with homozygoos Columbian-like restrictors, the result was nomore black in the hackles (so it's probably Db at work).For that reason I went for black-pigment intensifier(s) (Ml & cha) which give in my eyes good results for the contrast BUT they are on "eb" so grayish undercolor (which get through in sight) and "eWh" is not an option for "Silvers" !Probably a vicious circle.